244 INVERTEBRATA OF MASSACHUSETTS. 



GENUS SIGAR^TUS, LAM. 



Shell ear-shaped, aperture ample, spire small and depressed, 

 pillar spiral. 



SIGARE'TUS HALIOTOIDEUS. 



Shell obliquely ovate, pellucid, white, compressed ; aperture very 

 large ; spire minute and lateral. 



FIGURE 158. 

 State Coll., No. 54. Soc, Cab., No. 964. 



Helix haliotoidea, LIN. ; Syst. Nat., 1250. MARTINI; Conch., i. t. 16, f. 151. 



Bulk haliotoidea, MONTAGU ; Test. Brit., 211, pi. 7, f. 6, and vign. 2, f. 6. MA- 

 TON and RACKETT; Lin. Trans., viii. 123. BROWN; Encyc. Brit., vi. 462. 

 WOOD ; Index, pi. 18, f. 61. 



Sigaretus haliotoideus, LAM.; An. sans Vert., (1st ed.) vi. 208. FLEMING; Edin. 

 Encyc., vii. 66. Brit. Anirn., 360. BROWN ; Conch, of Great Brit., fyc., pi. 44, 

 f. 1,2. 



Oxy'noe glabra, COUTHOUY ; Bost. Journ. Nat. Hist., ii. 90, pi. 3, f. 16. 



Shell small, obliquely ovate, thin, pellucid, white, smooth and 

 shining ; lines of growth very faint ; whorls two, the first, situated 

 towards one side, is a mere nucleus for the last, which otherwise 

 constitutes the whole shell ; aperture nearly the whole area of the 

 shell ; outer lip sharp, entire, and somewhat expanded ; inner 

 lip sharp, with the edge a little turned, regularly curved in con- 

 formity to the left outline of the shell, and, entering the cavity of 

 the spire, is seen to terminate there ; in the other direction, the 

 curvature suddenly ceases, and, forming a slight angle, goes on- 

 ward to join the outer lip ; a thin plate of enamel connects the 

 two lips above. Length J inch, breadth f inch. 



Several specimens of this shell have been found, all of them 

 in the stomachs of fishes. They are about equal in size, but vary 

 somewhat in shape and convexity. The shell is precisely the 

 same as the European one bearing the above name. 



As it is not certain that its entire animal has yet been seen, its genus 

 remains undetermined. Mr. Couthouy rejects the genus SIGARE'TUS, 

 because, from what he saw of the animal, he judged the shell to be 

 external, and adopted the genus OXY'NOE of Rafinesque, with which 





